[Taxacom] What exactly is or is not a Gondwanan distribution?
calabar.john at gmail.com
Wed Mar 27 21:25:55 CDT 2013
I omitted the Atlantic Ocean which may be included as well.
On Wed, Mar 27, 2013 at 6:00 PM, John Grehan <calabar.john at gmail.com> wrote:
> Perhaps the simplest answer is that a gondwanan distribution is
> biogeographically one in which the relationships and massings point to a
> link across the Indian Ocean. Attempts to define gondwanan distribution in
> terms of a particular geography or geological scenario can run into
> arbitrary problems. For example, Nothofagus occurs in NZ, Australia,
> Antarctica and S. America and one might say that because these lands were
> once part of Gondwana, the distribution pattern also conforms in this
> regard. But in terms of massings and relationships Nothofagus does not
> conform to a gondwanic origin but conforms to the pattern of a Pacific
> group that merged with gondwanan margins.
> John Grehan
> On Wed, Mar 27, 2013 at 3:17 PM, Leavengood,John <tokay at ufl.edu> wrote:
>> Hello, everyone.
>> I am not well-versed in biogeography; hardly versed at all, in fact.
>> I have encountered many references to Gondwanan distributions often
>> pointing to taxa which span Australia, New Zealand, Southern Africa and
>> Chile/Argentina bound by the Andes. Definitions seem to match this
>> notion. So if a taxon (say, a tribe) has genera in New Zealand,
>> Australia, Chile and Argentina, but one genus among them occurs only
>> east of the Andes from northern Argentina all the way to Guatemala, is
>> that tribe still considered of Gondwanan distribution?
>> Why or why not? Or perhaps it points to a certain type of Gondwanan
>> distribution attributed to a particular timeframe facilitating that one
>> lineage propagated east of the Andes but has no members west of them?
>> I would appreciate answers accompanied by references, but all guidance
>> is appreciated.
>> John M. Leavengood, Jr.
>> Doctoral Candidate
>> University of Kentucky
>> Department of Entomology
>> S-225 Agricultural Science
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